Blade-fastening.



M. ROTTER.

' BLADE FASTENING.

APPLICATION FILED 0013.10, 1906.

899,622, Patented Sept. 29, 1908.

T lINVENTOR r v JTTORNEIT U DSTATQEQPATENT enrich.

MAX ROTTER, OF'MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS CHALMERS GOMPAN Y, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

BLADE-FASTENING.

Specification of Letters Patent.

Patented Sept. 29, 1908.

Application filed. October 10,1906. Serial No. 338,223.

gases, of the type in w ich are use a plurality of blades, usually arranged in groups, some of which are movable while others are stationary and serve as guide blades; and the purpose of this invention is to provide, in con unction with blade fastening means, means which also serve as baffling members for the adjacent blades to prevent the passage of the operating fluid between said blades and an inclosing member or casing.

On the drawings which accompany this specification and form a part thereof and on which the same reference characters are used to indicate the same elements ineach of the several views, Figure 1 represents an elevation of fragments of two adjacent blades, certain other parts being shown in section. Fig. 2 represents an elevation of fragments of two adjacent blades, other parts being shown in section, and showin a modification of the blade-securing meanss own b Fig. 1.

On the drawings the reference etter R represents a blade holding member which is recessed at r, and said recess, as shown by the drawings, is provided with an undercut side at t, the opposite side of the recess being straightbut provided with a bead or'depression Re ference character B represents a blade provided with a root 6 which is seated in the recess of the member R and is adapted to be secured therein by the securing members a, d

and e, as shown by Fi 1, or by the securin members 0 and d, as 510M711 by Fig. 2.

The securing members 0 may be;a retaining stri of any preferred type or structure, whi e the securing member e is preferably composed of a metal which can be calked or driven between the member 0 and the adjacent side of the recess in the member R, and

during such driving or calkingu-l ill flow into the depression f t securely together.

Reference character A. re ,esents' a blade adjacent to'theblade B whic is provided on ereby 10c g the parts its end with the shroud member s. The blades A and B, as shown by the drawings, are intended to represent either single blades 01 series of blades such as are used in steam turbines of the-Parsons type, and, as shown by the drawings. it is immaterial whether the bladesA be the -movable blades and the blades B the immovable blades, or vice versa, the drawings being intended to show clearly the relative arrangement of the several arts and relation which one blade or set of b ades bear to the next adjacent blade or set of blades.

In mechanism of the class to which this invention relates itis essential for obtaining the greatest efliciency that neither the 0 crating fluid nor the fluid o erated upon fie ermitted to pass by the Wor ing or movable fblades without impinging upon their working aces.

This invention rovides the blade holding member for one lade or one set of blades with means adapted to cooperate with the adjacent blade or set of blades to'prevent the fluid passing by the end of such blade or set of blades and the adjacent blade-holding member.

In Fig. 2 the securing member 0 is shown as provided with the rib g, which is projected close to the shroud s which is secured to the free ends of the adjacent blades. This rib g is made of transverse thickness sufficient to stand the pressure exerted against it, while at the same time presenting a minimum surface to be contacted by the shroud 8, should an'actual contact take place. i

With the construction just described, the projection 9 must be composed of the same material as the securingmembe'r c, said member on account of thestrength required be ing constructed of a tough metal. With the construction as shown by Fig. 1, however, in which at is a separate member, shaped in cross section substantially as shown, placed between the members 0 and e and becomes a part of the blade-securing means, any suitable substance, whether it be metallic or not, may be usedas the rib, as vulcanized'rubber or asbestos, and such rib need not necessarily extend clear to the bottom of the recess, as shown b Fig. 1.

be apparent that by extending a g partof the securing member'd or the ri ing betWenthe shmud-ca 'i ied-by said-blade which. permits of considerable lateral dis placement of the blade/SA as [shown by the drawings, Without enlarging the space existand the. baffle membe'r W1iat1elaimi's, The combination with a blade holding member R provided with a recess 13' a blade B seatedin' said recess, and the'secuting members a, d and 6 also seated insaid recess,

' iin theIiGWith i a baffle member is provicied :Lhe member d projecting froni theeb lade-.

holding ,membcrR and'adepted'to serve as a bafflemember for an'a'djac'ent blade A, said adjaeent blade A, one of said. blades being movable with respect to the other. y

In testimony whereof; I afiix my signature in the presence of two witnesses, MAX ROTTER. WVitnesses; v

, G, F. DE WEIN,

FRA K E. BENNETT. 

